mode_switch: clean up double code a bit
This commit is contained in:
Vince Weaver
parent
6104bc57d1
commit
95451c2149
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@ -1,5 +1,6 @@
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; split screen?
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; double modes
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; Test mid-screen mode switch on Apple IIe double modes
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; TODO: detect iic/iigs and vblank properly there
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; by Vince `deater` Weaver
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@ -7,18 +8,15 @@
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GBASL = $26
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GBASH = $27
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V2 = $2D
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MASK = $2E
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COLOR = $30
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;CTEMP = $68
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YY = $69
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HGRPAGE = $E6
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FRAME = $FC
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SUM = $FD
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YPOS = $FE
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TCOLOR = $FF
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; soft-switches
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; yes, I know these aren't necessary the "official" names
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EIGHTYSTORE = $C001
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CLR80COL = $C00C
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SET80COL = $C00D
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@ -36,9 +34,9 @@ SETAN3 = $C05F
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VBLANK = $C019 ; *not* RDVBL (VBL signal low)
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; ROM routines
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SETCOL = $F864 ;; COLOR=A*17
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SETCOL = $F864 ; COLOR=A*17
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SETGR = $FB40
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VLINE = $F828 ;; VLINE A,$2D at Y
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VLINE = $F828 ; VLINE A,$2D at Y
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HGR = $F3E2
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HPOSN = $F411
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HPLOT0 = $F457 ; plot at (Y,X), (A)
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@ -47,7 +45,7 @@ HGLIN = $F53A ; line to (X,A),(Y)
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;================================
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; Clear screen and setup graphics
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;================================
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split:
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double:
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jsr SETGR ; set lo-res 40x40 mode
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@ -74,7 +72,8 @@ draw_lores_lines:
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dex
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bpl draw_lores_lines
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; copy to 800
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; copy to 800 temporarily
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; yes this is a bit of a hack
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ldy #0
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cp_loop:
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@ -95,9 +94,9 @@ cp_loop:
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bit PAGE1
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; copy to AUX
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; copy to $400 in AUX
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bit PAGE2 ; $400 maps to AUX:$400
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bit PAGE2 ; $400 now maps to AUX:$400
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ldy #0
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cp2_loop:
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@ -187,7 +186,7 @@ wait_vblank_done_iie:
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bpl wait_vblank_done_iie
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;
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split_loop:
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double_loop:
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;===========================
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; text mode first 6*4 (24) lines
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; each line 65 cycles (25 hblank+40 bytes)
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@ -244,11 +243,13 @@ split_loop:
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jsr delay_1552
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; hi-res for last 96 lines + horizontal blank
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;==================================
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; vblank = 4550 cycles
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; Try X=226 Y=4 cycles=4545
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skip_vblank:
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nop
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ldy #4 ; 2
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@ -258,28 +259,14 @@ loop4: dex ; 2
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dey ; 2
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bne loop3 ; 2nt/3
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jmp split_loop ; 3
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jmp double_loop ; 3
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;=======================================================
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; need to align because if we straddle a page boundary
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; the time counts end up off
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.align $100
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; actually want 3112-12 (6 each for jsr/rts)
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; 3100
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; Try X=6 Y=86 cycles=3097
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delay_3112:
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lda $0 ; 3-cycle nop
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ldy #86 ; 2
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loop1: ldx #6 ; 2
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loop2: dex ; 2
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bne loop2 ; 2nt/3
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dey ; 2
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bne loop1 ; 2nt/3
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rts
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; actually want 1552-12 (6 each for jsr/rts)
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; 1540
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; Try X=15 Y=19 cycles=1540
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@ -295,25 +282,28 @@ loop6: dex ; 2
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rts
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;=========================
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; draw line of color in COLOR
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;==========================
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; draw horizontal DHGR line
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;==========================
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; color is in TCOLOR
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; Y position is in A
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;=========================
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draw_line_color:
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ldx #0
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ldy #0
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jsr HPOSN
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jsr HPOSN ; setup GBASL/GBASH with Y position
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ldy #0
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loop_it:
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line_loop_it:
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; set page2
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sta $C055
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sta PAGE2
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lda TCOLOR
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sta (GBASL),Y
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cmp #$80
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rol TCOLOR
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; set page1
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sta $C054
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sta PAGE1
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lda TCOLOR
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sta (GBASL),Y
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cmp #$80
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@ -321,13 +311,6 @@ loop_it:
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iny
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cpy #40
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bne loop_it
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bne line_loop_it
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rts
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; to run on bot, want this to be at $3F5
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; so load at $384
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jmp split
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